We have this thing that once we care about someone and they've been close to us, it never really goes away. If I'm able to, I check in on those who were, even if it's on FB or instagram or something. Just to see how they're doing out of curiosity. Even the treetrunked up ones (those I don't contact though).
I dunno about all Aries, but I don't mind staying friends with romantic interests if the situation permits. It's probably why he's contacting you.
But dude needs to lay off and realize some down time needs to happen first before you two revisit the idea of being friends.
I do think it's dumb on his part atm. Only selfish people keep in touch when they contact you after breaking up with you- mostly the whole "OMG HOW ARE YOU DOING??" bit. This isn't to ease your mind, it's to ease theirs.